Adds tags to an Amazon EMR resource. Tags make it easier to associate
clusters in various ways, such as grouping clusters to track your Amazon EMR
resource allocation costs. For more information, see Tagging Amazon EMRResources.

Request lenses

A list of tags to associate with a cluster and propagate to Amazon EC2
instances. Tags are user-defined key/value pairs that consist of a required
key string with a maximum of 128 characters, and an optional value string
with a maximum of 256 characters.